1. Introduction
The uxcell ME-8108 Momentary SPDT Limit Switch is designed for a wide range of mechanical applications to monitor the position of moving parts in machinery and industrial plants. This switch is suitable for use in safety circuits, control circuits, and auxiliary circuits for terminal limit protection. Its robust design ensures safe and reliable operation, featuring dust and oil-proof construction and a compact installation size. This manual provides essential information for the proper installation, operation, and maintenance of your ME-8108 limit switch.
2. Safety Information
WARNING: Electrical shock hazard. Always disconnect power before installation, maintenance, or troubleshooting.
- Installation should only be performed by qualified personnel familiar with electrical wiring and safety standards.
- Ensure the switch's voltage and current ratings (AC 250V, 10A; AC 380V, 6A) are compatible with your application.
- Do not exceed the specified electrical ratings to prevent damage or hazards.
- Protect wiring from sharp edges, heat, and moving parts.
- Verify all connections are secure before applying power.
- This product is for general use and may not be suitable for all critical safety applications without additional safety measures.
3. Product Overview
The uxcell ME-8108 is a momentary, automatic reset limit switch featuring a SPDT (Single Pole Double Throw) contact configuration, providing one Normally Open (NO) and one Normally Closed (NC) contact. It is equipped with a roller lever actuator, designed for precise position detection.
Figure 1: Two uxcell ME-8108 Limit Switches. These switches feature a blue body, black base, and a metal roller lever actuator. The image shows the general appearance and size of the product.
Key Features:
- Model: ME-8108
- Actuator Action: Momentary, Automatic Reset
- Contact Type: 1NC + 1NO (SPDT)
- Rated Voltage/Current: AC 250V, 10(4)A; AC 380V, 6(2)A
- Construction: Dust and oil proof
- Applications: CNC machines, 3D printers, endstops, door switches, and various automation controls.
4. Specifications
| Feature | Specification |
|---|---|
| Product Name | Limit Switch |
| Model No. | ME-8108 |
| Actuator Action | Momentary |
| Actuator Type | Automatic Reset |
| Contact Type | 1NC + 1NO (SPDT) |
| Rated Voltage Current (AC) | 250V, 10(4)A; 380V, 6(2)A |
| Stick Total Length | 105mm / 4.1" |
| Body Size (L*W*T) | 95 x 30 x 25mm / 3.7" x 1.2" x 1" |
| Mounting Hole Diameter | 4.4mm / 0.17" |
| Mounting Hole Distance (L*W) | 56 x 21mm / 2.2" x 0.83" |
| Material | Rubber, Plastic, Metal |
| Operation Mode | Automatic |
| International Protection Rating | IP00 (Note: This rating indicates no special protection against ingress of solids or liquids. The product description mentions "dust and oil proof" which might refer to internal components or specific parts, but the official IP rating is 00.) |
5. Setup and Installation
5.1 Mounting
- Identify a suitable mounting location where the switch's roller lever actuator can be reliably engaged by the moving part of your machinery.
- Ensure the mounting surface is flat and stable.
- Mark the drilling points using the specified mounting hole distance of 56 x 21mm (2.2" x 0.83") and a mounting hole diameter of 4.4mm (0.17").
- Drill the mounting holes.
- Secure the limit switch using appropriate fasteners (not included) through the mounting holes. Ensure the switch is firmly attached and does not wobble.
- Adjust the position of the switch so that the roller lever actuator is properly engaged and disengaged by the moving part at the desired limit points.
5.2 Wiring
The ME-8108 is a SPDT (Single Pole Double Throw) switch, meaning it has one common terminal and two output terminals: one Normally Open (NO) and one Normally Closed (NC). This allows for flexible integration into various control circuits.
- Normally Open (NO): The circuit is open when the actuator is not pressed and closes when the actuator is pressed.
- Normally Closed (NC): The circuit is closed when the actuator is not pressed and opens when the actuator is pressed.
- Before wiring, ensure all power to the circuit is disconnected.
- Open the wiring cover on the switch body.
- Connect the common wire to the designated common terminal.
- Connect your control circuit wire to either the NO or NC terminal, depending on your application's logic.
- Ensure all wire connections are tight and secure to prevent loose contacts or short circuits. Use appropriate wire sizes for the rated current.
- Close the wiring cover securely to maintain dust and oil protection.
6. Operation
The uxcell ME-8108 is a momentary limit switch with an automatic reset function. This means the switch contacts change state only while the actuator is physically pressed or engaged. Once the actuator is released, it automatically returns to its original position, and the contacts revert to their default (unactuated) state.
- When the moving part of your machine engages the roller lever actuator, the switch contacts will change state (NO closes, NC opens).
- When the moving part disengages the actuator, the roller lever returns to its original position, and the contacts revert to their unactuated state (NO opens, NC closes).
- Ensure the actuator is not subjected to excessive force or impact that could damage the mechanism.
7. Maintenance
Regular maintenance helps ensure the longevity and reliable operation of your limit switch.
- Inspection: Periodically inspect the switch for any signs of physical damage, wear on the actuator, or loose connections.
- Cleaning: Although the switch is designed to be dust and oil proof, it is good practice to gently clean any accumulated dust or debris from the exterior of the switch and around the actuator mechanism. Use a soft, dry cloth. Avoid using harsh chemicals or solvents.
- Actuator Check: Verify that the roller lever actuator moves freely and returns to its original position without sticking.
- Wiring Integrity: Check wiring for fraying, cuts, or loose terminals. Tighten any loose connections.
8. Troubleshooting
If you encounter issues with your uxcell ME-8108 limit switch, refer to the following troubleshooting guide:
| Problem | Possible Cause | Solution |
|---|---|---|
| Switch not activating/deactivating |
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| Intermittent operation |
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| Switch contacts remain open/closed |
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9. Warranty and Support
For information regarding warranty terms and conditions, please refer to the purchase documentation or contact uxcell customer support directly. Ensure you have your product model number (ME-8108) and purchase details available when seeking support.
Contact Information: Please visit the official uxcell website or the retailer where the product was purchased for customer service and technical support.
